Zuzana Gruberova ; Zdenek Dolezal ; Petar Rados ; Ami Rostomyan

2021
Charles University Prague

Abstract: This master thesis describes the measurement of the π0 reconstruction efficiency correction using τ-pair events from the Belle II experiment. The review part of the thesis begins with an overview of the Standard Model and the Belle II experiment, its detector system and the simulation software. This is followed by the description the τ-pair events and the method used for measuring the π0 reconstruction efficiency correction. The central part focuses on the event selection and the extraction of the signal yields. The results present the measured values of the average and momentum dependent π0 reconstruction efficiency correction, an improved π0 selection optimized for τ-lepton analyses, and a dedicated study on photon timing selection requirements.

Note: Presented on 22 06 2021
Note: MSc